Drawing-board



(No Model.)

B. E. SAWYER.

DRAWING BOARD. N9). 435,980. Patented Sept. 9, 18.90.

'f1-t mmm ml IIMIH. l l l v .WW W im MW 1 MII' i "MI MIHI'H' *M U. l. i. gtr t M lllllllillllh Ill Wbses: @l/hill www J fm M1718 Wye-r) OMMJWtM/fff by www?? UNTTED STATES PATENT OFFICE.

BURNSIDE E. SAWYER, OF A'FHOL, MASSACHUSETTS.

DRAWING-BOARD.

SPECIFICATION forming part of Letters Patent No. 435,980, dated September 9, 1890.

Application iiled J' une l 1, 1890. Serial No. 355,011. (No model.)

To all whom it may concern:

Be it known that I, BURNSIDE E. SAWYER, ofI Athol, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Drawing Boards, of which the following taken in connection with the accompanying drawings, is a specification.

This invention relates to drawing-boards, and has for its object the construction of a drawing-board that can be more readily and easily kept true;v and it consists in certain novel features of construction, arrangement, and combination of parts which will be readily understood by reference to the description of the drawings and to the claims hereinafter given, and in which my invention is clearly pointed out.

Figure l is a plan of my improved drawing-board. Fig. 2 is a horizontal section of a portion of the drawing-board at the upper left-hand corner of Fig. 1. Fig. 3 isa similar section of a portion of the drawing-board at the lower left-hand corner of Fig. l. Fig. 4 is a vertical section through a portion of the board on line 1 1 on Fig. 2. Fig. 5 is a partial vertical section on line 2 2 on Fig. 2. Fig.

6 is a partial vertical section on line 3 3 on Fig. 2. Fig. 7 is a partial vertical section on line 4 4 on Fig. 3. Fig. 8 is a partial vertical section on line 5 5 on Fig. 3. Figs. 9, lO, and 11 are respectively a side elevation and end View and a transverse section of the eccentric adj usting-pin for connecting the movable end of the pivoted bar to the fixed bar, as will be more fully described.

In the drawings,'A is the main body of the drawing-board, made, preferably, of well-seasoned soft-pine wood, and having formed in two at least. of its edges rectangular grooves extending the whole length of the sides or ends in which they are formed, and also having formed in its upper side a rabbet a, eX- tending along one side and across one end, as shown.

A T-shaped metal bar B, having its central rib b out short at one end and having secured thereto at said shortened end the two plates b b2 by screws or rivets so as to project loeyond the end of said shortened rib and form a fork, is permanently secured to one edge of said board, with its central rib in said groove, by screws c c, as shown in Figs. 1, 3, and 8. To the opposite edge of the board A is secured in like manner a short section of a similar T-shaped bar D, having its central rib d shortened and the plates d and d2 secured thereto, as shown in Figs. 2, 4, and 5. To the fork of the bar D is pivoted at e one end of the T-shaped metal bar E, the central rib e of which enters the groove in the end of the board A and has formed in the end thereof opposite to the pivot c an open slot e2 to receive the eccentric neck g of the adjusting-pin F, which is mounted in bearings in the plates o and b2, which form the fork of the bar B.

The pin F has formed in its end a slot to receive a screwdriver for turning it about its axis when it is desired to adjust the bar E.

The bars B and E have their faces planed and ground to perfectly straight and true surfaces, and the inner faces of their upper ribs b3 and e3 are planed so as to be substantially of an even thickness, as shown.

The rabbets a o formed in the corners of the board A, together with the inner faces of the ribs h3 and e3, form grooves in the upper surface of the board, which are intended for use in connection with another invention of mine-viz., an improved T-square-which forms the subject-matter of another applica .shop every time it is found out of square, for

by simply turning the eccentric-pin one way or the other the bar E can be adjusted till it it is found to be accurately at right angles to the bar B.

1. A drawing-board having a metal bar secured to one of its edges in a Xed position, and a second metal bar secured to another edge at right angles to the first bar, said second bar being connected at one end to the -board by a hinge-joint and at its opposite IOC end by an eccentric-pin, whereby said second bar may be readily and accurately adjusted relative to the firstnamed bar.

2. In a drawing-board, the combination of the main body of the board made of Wood or other suitable material, and having two of its edges grooved and rabbeted along its upper c orner, a metal bar of T shape in cross section secured in a fixed position to one edge of sald main body with its central rib in the groove ot said main body, so as to form a rectangular groove between the metal and wood along the upper side of the board, and a second bar of metal of like cross-section attached to another edge of said board at right angles to the first-mentioned metal bar by a hinge or pivotal connection at one end, and at its other end by means of an eccentric adjListing-pin7 1n position to forni a rectangular groove between the metal and Wood along its upper side.

3. In combination with the main body of a drawing-board, the T-shaped bar having its central or horizontal rib shortened at one end, and having secured thereto upon each side a short plate, which extends beyond the shortened rib to form a fork, said plates having formed in said projecting ends circular openings or bearings, a pin set in said bearings and having its middle portion reduced in size and made eccentric to its end portions, and a second Tshaped bar having a slot formed in one end of its central or horizontal rib to receive the eccentric neck of the pin.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing Witnesses, on this 7th day of June, A. D. 1890.

BURNSIDE E. SAVVYER.

"Witnesses:

HENRY H. KENDALL, N. C. LOMBARD. 

